When more than one user of an application program is interacting with the database at one time, we say that their transactions are running concurrently.Concurrent transactions can run in one of two ways: Cookies are returned and stored in the user's browser, session data is stored on your web server. The sessionStorage object stores data for only one session (the data is deleted when the browser tab is closed). A directory of Objective Type Questions covering all the Computer Science subjects. Which one of the following is the default PHP session name? However you may only want to store some data for the duration of a user session. If, for example, youre currently storing sessions inside your applications database, you could move the session store part to its own database. Cookies are a well-understood mechanism that can even be used in a client-only manner using JavaScript. As soon as you need more than one front server, things can become quite tricky. more , Scripting, Software Engineering and Stuff in Between, Patterns of Enterprise Application Architecture. Thats about as simple as it gets. PHP Objective type Questions and Answers. In this video tutorial I'll show you how you can store session data inside your database. They all differ in scalability, failover capabilities, and complexity. The questions asked in this NET practice paper are from various previous year papers. The thing connecting a session to a client browser is the session ID, which is usually stored in a cookie (see the comments for exceptions to that rule). They are useful for small portions of data that arent security relevant. Session data itself is usually not any more sensitive than the rest of the contents of the database. Basically a session is a variable used between the client and the server that is stored on the server side. It creates a file here with the name of the users session ID prefixed with sess_ (Example: /tmp/sess_9gk8f055hd61qll6a8pjpje2n2).The contents of the session can be optionally encrypted before being placed on the browser. This attack is known as.. Say I want to change the extension of a PHP file, which of the following statements should I edit to change from .php to .html in the httpd.conf file? Use cookies for small pieces of possibly long-term data where security is not an issue. Im not aware of any off the shelf products, but since storing session data is typically not the most difficult problem, you could try to roll your own based on a caching product (memcached comes to mind, as do at least a dozen Java caching solutions). Which PHP function offers to send raw arbitrary HTTP headers? Ill give you a quick rundown on the major themes. A session can have a single mapping at a time and once assigned, it cannot be changed. Questions from Previous year GATE question papers, UGC NET Previous year questions and practice sets. I'll give you a quick rundown on the major themes. the data remains until the user closes that window or tab. We will discuss both, the inproc and outproc modes in detail later in the article. Passing data within application: S.No. Here you can access and discuss Multiple choice questions and answers for various competitive exams and interviews. Let's try out the following example to understand how it basically works: Listing 1 The code in Listing 1 increments a number and prints it out. To execute a session task, it must be added to a workflow. The life span of a cookie can be set to almost any duration of your choosing. If one computer running SQL Server fails, another server in the cluster can take over and serve requests without session-data loss. Sometimes, especially for high traffic web sites, it makes sense to store session data on a dedicated server or cluster. The problem is the usual: The database server may become your bottleneck. Informal polls or simple preferences like language selections are often implemented via cookies. This means that if you store some data, close your browser and then open up your appllication again, all of the data will still be retrievable. Depending on the implementation, a failing front server doesnt necessarily mean a loss of session data. To configure SQL Server mode for a failover cluster, you must specify -sstype p when you execute the Aspnet_regsql.exe tool so that session state data is stored in the ASPState database instead of the tempdb database. If its on the client, it will be stored by the browser, most likely in cookies and if it is stored on the server, the session ids are created and managed by the server. Umesh Awasthi Oct 18 '13 at 2:17 @MichaelT: That is one of option i was thinking of, but have to cross check it. Not having to keep state on your servers saves you from a lot of trouble. When you save data into the Session (such as being logged in), the Session will store that data into a file onto the server. a) 3 b) 4 c) 5 d) 6 It is important to chose the right place for your data. Session state can be stored in one of the following modes: In - Process: Stored This takes complexity out of your web servers at the cost of an increased overall system complexity. The sessionStorage object work in the same way as localStorage, except that it stores the data only for one session i.e. If we take PHP on Unix as an example it may store the session on the filesystem in the /tmp folder. To prevent users from viewing and manipulating files such as /etc/password, which one of the following statements should you use? What is going on? How many ways can a session data be stored? The session is mainly used for time duration for the client and server interactions. Suppose all web material is located within the directory /home/www. SessionID Client Machine Cookies are being used by a session to store a session id. URL Rewriting. Which function is used to erase all session variables stored in the current session? Any business IT solution must store data, be it customer information, inventory data, financial transactions, documents or pictures. The cookie determines which front server subsequent client requests are directed to. Each time you refresh the page, the number picks up where it left off.
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